Clock holders



FIG. 1 is a top and left front perspective view of a clock holder showing my new design;

FIG. 2 is a top plan view thereof;

FIG. 3 is a rear elevational view thereof;

FIG. 4 is a cross-sectional view as taken from line 4--4 of FIG. 1. 

The ornamental design for a clock holder, as shown and described. 